Hitchhiking out

From the main square (Plaza Pagano), you can walk south along San Martín a couple of blocks until you get to Belgrano. Turn left, and that'll take you out of town. (It's the same road that takes you to the Cerro Piltriquitrón and the Bosque Tallado.) There are no really good spots where the traffic actually slows much (like speedbumps or traffic lights), but once you get about a kilometer or so away from the center of town, you shouldn't have too hard of a time getting a ride.